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Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au Gunther Roland/MIT for the PHOBOS Collaboration BNL June 18, 2003.

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Presentation on theme: "Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au Gunther Roland/MIT for the PHOBOS Collaboration BNL June 18, 2003."— Presentation transcript:

1 Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au Gunther Roland/MIT for the PHOBOS Collaboration BNL June 18, 2003

2 Collaboration Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Bruce Becker, Russell Betts, Abigail Bickley, Richard Bindel, Andrzej Budzanowski, Wit Busza (Spokesperson), Alan Carroll, Patrick Decowski, Edmundo Garcia, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen, Stephen Gushue, Clive Halliwell, Joshua Hamblen, Adam Harrington, Conor Henderson, David Hofman, Richard Hollis, Roman Holynski, Burt Holzman, Aneta Iordanova, Erik Johnson, Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo, Jang Woo Lee, Willis Lin, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Aaron Noell, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Inkyu Park, Heinz Pernegger, Corey Reed, Louis Remsberg, Christof Roland, Gunther Roland, Joe Sagerer, Pradeep Sarin, Pawel Sawicki, Iouri Sedykh, Wojtek Skulski, Chadd Smith, Peter Steinberg, George Stephans, Andrei Sukhanov, Ray Teng, Marguerite Belt Tonjes, Adam Trzupek, Carla Vale, Robin Verdier, Gábor Veres, Bernard Wadsworth, Frank Wolfs, Barbara Wosiek, Krzysztof Wozniak, Alan Wuosmaa, Bolek Wyslouch, Jinlong Zhang ARGONNE NATIONAL LABORATORYBROOKHAVEN NATIONAL LABORATORY INSTITUTE OF NUCLEAR PHYSICS, KRAKOWMASSACHUSETTS INSTITUTE OF TECHNOLOGY NATIONAL CENTRAL UNIVERSITY, TAIWANUNIVERSITY OF ILLINOIS AT CHICAGO UNIVERSITY OF MARYLANDUNIVERSITY OF ROCHESTER

3 PHOBOS preliminary Au+Au 200 GeV 15% central How to connect observed final state particles to theory of strong interaction? ?

4 Rapidity Density 600 1200 Compilation by K. Eskola Particle Multiplicity at RHIC

5 Rapidity Density 600 1200 PHOBOS Central Au+Au (200 GeV) Compilation by K. Eskola PHOBOS multiplicity papers: Phys. Rev. Lett. 85, 3100 (2000) Phys. Rev. Lett. 87, 102303 (2001) Phys. Rev. C 65, 31901R (2002) Phys.Rev. Lett. 88, 22302 (2002) Phys. Rev. C 65, 061901R (2002) nucl-ex/0210015, PRL in Press nucl-ex/0301017, subm. to PRL Multiplicity at low end of range –But: Energy density 30x nuclear matter Most models didn’t do so well

6 Parton Saturation Low Energy High Energy Particle Multiplicity at RHIC Rapidity Density 600 1200 PHOBOS Central Au+Au (200 GeV) Compilation by K. Eskola Color Glass

7 Rapidity Density 600 1200 PHOBOS Central Au+Au (200 GeV) Compilation by K. Eskola Color Glass Hadron multiplicities at RHIC well described by Parton Saturation Particle Multiplicity at RHIC Kharzeev & Levin, Phys. Lett. B523 (2001) 79 Data: PHOBOS, Phys. Rev. Lett. 87, 102303 (2001)

8 p T Spectra for Au+Au @ 200 GeV 0.2<y   <1.4 Data: PHOBOS, nucl-ex/0302015 Submitted to Phys Lett B Relative to UA1 p+p

9 Centrality Dependence vs p T PHOBOS, nucl-ex/0302015 Similar centrality dependence at p T = 0.5 and 4 GeV/c ! Initial State Coherence? Interaction in Dense Medium?

10 Predictions for d+Au Vitev, nucl-th/0302002, Phys.Lett.B in press Vitev and M.Gyulassy, Phys.Rev.Lett. 89 (2002) Central Peripheral Kharzeev, Levin, McLerran, hep-ph/021332 “~30%suppression of high p T particles” (central vs peripheral) 16% increase central vs peripheral Nuclear Modification Factor R dAu Parton Saturation pQCD

11 PHOBOS Detector 2003 SPECTRIG T0 mini-pCal pCal i.Moved TOF walls back 5 m from interaction point ii.New on-line high p T Spectrometer Trigger iii.New “time-zero” (T0) Cerenkov detectors On-line vertexing and ToF start time iv.Forward proton calorimeters on Gold and Deuteron sides v.DAQ upgrade (x10)

12 Centrality Determination in d+Au Multiplicity distribution Pseudorapidity Glauber Calculation Hijing 1.383 Hulthen w.f. 41mb inelastic cross-section Full GEANT Simulation HIJING Simulation dN/d  Counts

13 d+Au p T Spectra Compare to p+p reference… From Glauber (HIJING 1.383) 41mb (same as for Glauber) From UA1, using Pythia to go from |  | < 2.5 to 0.2 <  < 1.4 …for each centrality bin PHOBOS d+Au: nucl-ex/0306025

14 central Au+Au All syst. uncertainties: 90% C.L. PHOBOS d+Au: nucl-ex/0306025 R dAu vs p T

15 Centrality dependence of R dAu Data disfavor initial state interpretation of Au+Au high-p T suppression N.B. Smaller  pp inel would increase R dAu central vs R dAu peripheral PHOBOS d+Au: nucl-ex/0306025 All syst. uncertainties: 90% C.L.

16 Initial State ‘Final State’ Interactions Multiplicity systematics connected to initial state Consistent with parton saturation picture Interaction of fast partons with dense medium has been observed Quantitative diagnostic tool now established Connection to QCD

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